On February 28th, 2012, the Los Angeles County Museum of Art began transport of a 340-ton granite megalith from a quarry in Riverside County to the museum's campus for the making of "Levitated Mass", a sculpture by artist Michael Heizer. The eventual work wlll be composed of a 456-foot-long slot over which the megalith will be suspended. Heizer conceived of the artwork in 1968, but discovered an appropriate boulder only decades later, in Riverside County, California. At 340 tons, the boulder is one of the largest megaliths moved since ancient times. Transport, made possible by Hanjin Shipping, takes place over the course of roughly eleven nights, traveling through four counties (Riverside, San Bernardino, Orange, and Los Angeles) and twenty-two cities. The transporter carrying the boulder, specially designed for maximum safety, is traveling a predetermined route with movement happening only at night.